class Tracker:
    def __init__(self,board, words):
        self.known_posts = []
        self.words = words
        self.board = board
    def track(self):
        # for every post in some collection
        for post in collectionofposts:
            # for every word in word list
            for word in self.words:
                # if word in post and post not in known posts
                if word in post and not post.number in self.known_posts:
                    # alert
                    alert(post)
                    # ignore for later
                    self.known_posts.append(post.number)
